.wrap3 {
    display: flex;
    min-height: 60px;
}

.wrap3 .left {
    flex-basis: 300px;
    background: white;
}

.wrap3 .right {
    flex-basis: 300px;
    background: white;
}

.wrap3 .center {
    flex: 1;
    background: white;
}
